Bobbin holder for winding and twist frames



Nov. 22, 1966 G. FRANZEN ETAL BOBBIN HOLDER FOR WINDING AND TWIST FRAMES Filed Aug. 31, 1964 4 Sheets-Sheet 1 m emans Nov. 22, 1966 G. FRANZEN ETAL 3,286,948

I BOBBIN HOLDER FOR WINDING AND TWIST FRAMES Filed Aug. 31, 1964 4 Sheets-Sheet 2 4 I} 1/ A ,4; 1,, mm W I4 A/ jrWe/vzors Nov. 22, 1966 G. FRANZEN ETAL. 3,286,948

BOBBIN HOLDER FOR WINDING AND TWIST FRAMES Filed Aug. 31, 1964 4 Sheets-Sheet 4 1 vemor's 17 2% g 2%? 1% United States Patent 3,286,948 BOBBIN HOLDER FOR WINDING AND TWIST FRAMES Gustav Franzen, Neel-sen, and Heinz Stenmans, Grefrath, Germany, assignors to Klaus Nimtz, Krefeld, Germany Filed Aug. 31, 1964, Ser. No. 393,315 Claims priority, application Germany, Sept. 12, 1963, N 23,744; Apr. 11, 1964, N 24,778 14 Claims. (Cl. 242-129.51)

The invention relates to a device for the reception of the tubular bobbin cores in the bobbin holders of winding and twist frames. An important facility which the holders for bobbin cores must possess is that they must permit the cores and hence the bobbins to be easily doifed and replaced by fresh cores. The tubular cores are not always all of the same length and they do not possess well defined edges because these are often damaged in use. Consequently the plates for the reception of such core tubes must be yielding and yet hold the core tube and the bobbin in a well defined position.

For solving this problem diverse solutions have already been proposed, but none of them is completely satisfactory. The invention contemplates an arrangement that will permit the tubular bobbin cores to be easily replaced and at the same time provide a safe but flexible mount. Moreover, the proposed arrangement is intended to be adaptable to bobbin cores of different sizes.

The solution offered by the present invention consists in providing ball-headed pins inserted into the arms of the bobbin holder and centering plates for the reception of the bobbin cores formed with sockets at least partly of resilient plastics material to permit them to be clipped on to the ball heads of the pins liks press fasteners.

In order to reduce the bearing friction in these press fastener type of bearings and also to permit lubrication which will last for the life of the bearing, it is further proposed to construct the inside surfaces of the socket for the ball of the ball-headed pin from two materials which differ in their respective elasticities and sliding properties. This type of construction renders it possible,

in virtue of the elasticity of the material, to press the plate like a press stud on to the ball head of the pin and at the same time to hold the ball in position in a material providing the minimum of bearing friction.

In the further development of this area the surfaces of the centering plate are so contrived that they form a cylindrical socket with a rectangular cross section. The space between the surfaces of the ball and the fiat faces of this socket provides a reservoir for a lubricant.

In a preferred form of construction, rectangular, possibly divided, linears of inelastic wear-resistant material are inserted into the elastic material of the centering plate. Alternatively, an elastic material may be used for the centering plate and a ring of inelastic non-wearing material inserted therein. Conversely, an inelastic material could be used for making the centering plate and a ring of elastic material inserted.

In view of the fact that the balls of ball-headed pins have more recently been formed with a flattened pole for reasons involved in production techniques, it is advisable to give the surface of the socket facing such a pole of the ball head a spherical shape or to provide a convexly crowned insertion element at this point. This element may be adjustable, e.g., by screw action.

Preferred embodiments of the invention are illustratively shown in the drawings in which FIG. 1 is a perspective view which shows a bobbin holder carrying a tubular bobbin core and FIG. 2 is an exploded view of the arms of the bobbin holder, of the ball-headed pin and of the centering plates.

FIGS. 3 to 10 are fragmentary detail views partly in ice section which show particular embodiments of the socket for the reception of the ball head.

The shape of the bobbin holder 1 is as conventionally used, for instance in double twist frames. It comprises one rigid arm 2 with a recessed face 3 containing the means for receiving the tubular bobbin core 9. The other arm 4 of the bobbin holder is pivotable. The free end of this arm is similarly formed with a recessed face 3 of identical construction to that of arm 2. By pivotably deflecting arm 4 the gap between the two arms 2 and 4 can be widened for the insertion of a tubular bobbin core 9 between the two faces 3.

According to the invention each face 3 is fitted with a ball-headed pin 5 which may be screwed, riveted or cast into the centre thereof. A centering plate 6 can be clipped on to the ball heads. To this end each plate is provided with a socket 7 for the reception of the ball. The provision of the socket 7 permits the centering plate to be clipped on to the ball head of the pin in the manner of a press fastener. The socket 7 should be so contrived that it will embrace more than half of the ball of the pin.

This press-on connection permits the centering plate 6 to yield and to adapt itself to any conformation of the edges of the tubular core so that the core and hence the bobbin will run in the frame perfectly smoothly and uniformly. Allowance can easily be made for differences in the diameter of the tubular cores by exchanging the centering plates, an operation which is quite readily possible because of the press fastener seating of the plate. The centering plate must be provided with a suitable bearing face for the tubular core. This face is indicated at 8. The bearing face 8 should in practice be located in that plane which also contains the centre of the ball of the ball-headed pin 5 when the centering plate has been clipped on to the same.

Generally speaking, the most suitable form of construction is to make the centering plate of an elastic plastics material, that is to say to contrive the plate in such a way that the socket 7 for the ball likewise consists of this elastic plastics material. However, the socket for the ball might alternatively consist of a stronger material, such as steel or metal, in which case the edges of the socket would be slotted to provide the required yielding elasticity for a press-on fastening.

Specific embodiments are illustrated in FIGS. 3 to 10, each figure representing an axial section of the socket for the ball. In each of FIGS. 3 to 10 the ball-headed pin is marked 11, the ball head 12 and the centering plate, which is only fragmentarily shown, is marked 13. The socket for the ball of the ball-headed pin is formed in the centering plate, the inside surfaces of the socket being constituted by two different materials of different elasticities and different sliding properties. In FIG. 3 the centering plate 13 and hence the surface portion 14 consists of an elastic material, whereas the liner 15 is made of an inelastic and more wear-resistant material of good sliding properties. This material 15 forms a cylindrical liner with a rectangular axial section so that a space 16 is formed between the ball 12 and the liner 15. This space serves for the reception of a lubricant and it will be readily understood that a reservoir for lubricant can thus be provided which should sufiice for the life of the bearing. The extensions 17 of the liner 15 are anchoring members which facilitate the production of the bearing in an injection mould.

For inserting the ball head into a socket of the kind shown in FIG. 3 the centering plate 13 is simply thrust on to the ball 12 like a press stud, its edge at 14 resiliently yielding and then re-embracing the ball when this is in the position actually shown in 'FIG. 3.

FIG. 4 is a substantially similar arrangement to that in FIG. 3 and similar materials are used for its constructaking up radial forces. The flattened pole bears against.

a spherical insertion which takes up the axial thrust. In

FIG. the spherical insertion has the form of a ball 11-1,

Whereas in FIG. -6 it is a grub screw 112 with a crowned terminal :face 113. The latter arrangement has the advantage that the screw can be adjusted in its threads for taking up wear.

Whereas in the embodiments according to FIGS. 3 to 6 a portion of the inside surfaces of the socket consists of an elastic material, the arrangement in FIGS. 7 and 8 is one in which the liner 15 forms the entire inside surface. To permit the ball head to be pushed into the socket like a press stud, the liner 15 is of divided construction in a manner permitting it to yield outwards at .114. In the embodiment according to FIG. 8 the liner 15 comprises a substantially cylindrical portion 115 and a floor portion 116, the two parts being loosely fitted together to permit the ends of part 115 to separate in relation to the floor portion 116. If desired, the liner 15 could also be formed from more than two par-ts.

If, as assumed in FIGS. 9 and 10, the centering plate consists of an inelastic highly wear-resistant material indicated at 13, then the socket for the ball head 12 is rearwardly closed by a ring of elastic material. In FIG. 9 this ring 1-17 has conic-ally tapering bearing faces, whereas in FIG. a circular section ring is provided.

A person skilled in the art will be as familiar with plastics materials of low elasticity and high wearing properties as withel-astic plastics materials, such as might be used for the purposes of the present invention.

What we claim is:

1. A device for the reception of tubular bobbin cores in bobbin holder arms of winding and twist frames, comprising centering plates for a said core and means defining ball and socket connection between the said centering plates and the said arms press-fastening fashion and serving as bearing means for rotatably supporting said centering plates in relation to thesaid arms.

2. A device for the reception of tubular bobbin cores in bobbin holder arms of winding and twist frames, comprising pins each having a ball head inserted into the said arms and centering plates having a socket and said socket having an inwardly directed mouth elastically yieldable to pressure of the ball head, to permit the said centering plates to be pushed onto the ball heads of the pins like press fasteners.

4 3. A device according to claim 2, in which the center of each ball head is located substantially in the plane in which the tubular core will bear against the centering plate.

4. A device according to claim 2, in which the inner bearing surface of the socket for the ball head of the said pin in the centering plate is formed by two materials of difierent elasticities and different sliding properties.

5. A device according to claim 2, in which the socket forms a chamber of faceted cross section and the space provided between the flat faces of the chamber and the surface of the ball head serves for the reception therein of a lubricant.

6. A device. according to claim 2, in which the socket forms a chamber of rectangular cross-section.

7. A device according to claim 2, in which the socket forms a chamber of cylindrical form and the space provided in the cylinder serves for the reception therein of a lubricant.

8. A device according to claim 2, comprising a said centering plate of elastic material and a liner inserted into the said plate of relatively inelastic Wear-resistant material.

9. A device according to claim 2, in which the socket comprises a wear resistant liner and this is divided so as to be expansible to allow for the passage over the ball.

7 10. A device as claimed in claim 2, in which the plate is of elastic material and in which a ring of inelastic wearresistant material is inserted into the said socket to co-. 1

operate with the ball head of the pin to take radial thrust.

11. A device as claimed in claim 2,.in which hte center 1 ing plate is of inelastic material and further comprises a 5 ring of elastic material mounted in said centering plate to enable the plate to be forced into engagement with the ball head.

12. device as claimed in claim 2, in which the base i of the socket bearing against the pole of the ball head 1 of the pin is spherically convex.

13. A device according to claim 2, further including a spherical element mounted in the base of the socket.

14. A device according to claim 2, further including an adjustable element with at least a spherical head isrnounted in the base of the socket.

8/1940 Hamel 242-129.51 X 3/1957 Wentz 24217 

1. A DEVICE FOR THE RECEPTION OF TUBULAR BOBBIN CORES IN BOBBON HOLDER ARMS OF WINDING AND TWIST FRAMES, COMPRISING CENTERING PLATES FOR A SAID CORE AND MEANS DEFINING BALL AND SOCKET CONNECTION BETWEEN THE SAID CENTERING PLATES AND THE SAID ARMS PRESS-FASTENING FASHION AND SERVING AS BEARING MEANS FOR ROTATABLY SUPPORTING SAID CENTERING PLATES IN RELATION TO THE SAID ARMS. 